Fully-Plastic Crack Growth in Asymmetric Plane Strain Bending.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
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The crack growth ductility of notched parts depends highly on the mode of loading as well as on the geometry. Specimens of symmetrical geometry are commonly tested to predict the plastic behavior of the material under specific loading conditions, but vessels and other structural components often have welds which introduce asymmetric geometry and inhomogeneous properties. In single edge groove, fully-plastic tensile specimens with asymmetries that give a single shear band, a crack can propagate with 13 the ductility of symmetrical shear bands. Since bending involves more triaxiality, the ductility in asymmetrically grooved cantilever bending is likely to be further reduced, which may lead to an unsafe structure. The triaxiality, slipline geometry, and upper bounds to the limit load are described in detail. Medium strength, low-hardening steels HY-80 and HY-100 were tested under configurations that showed more triaxiality under one single active slipline field than single edge notch tension specimens.
- Metallurgy and Metallography
- Structural Engineering and Building Technology